251225111 has 2 divisors, whose sum is σ = 251225112. Its totient is φ = 251225110.

The previous prime is 251225101. The next prime is 251225123. The reversal of 251225111 is 111522152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251225111 - 2²² = 247030807 is a prime.

It is a super-2 number, since 2×251225111² = 126228112793924642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251225101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125612555 + 125612556.

It is an arithmetic number, because the mean of its divisors is an integer number (125612556).

Almost surely, 2^251225111 is an apocalyptic number.

251225111 is a deficient number, since it is larger than the sum of its proper divisors (1).

251225111 is an equidigital number, since it uses as much as digits as its factorization.

251225111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200, while the sum is 20.

The square root of 251225111 is about 15850.0823657166. The cubic root of 251225111 is about 630.9878773677.

Adding to 251225111 its reverse (111522152), we get a palindrome (362747263).

The spelling of 251225111 in words is "two hundred fifty-one million, two hundred twenty-five thousand, one hundred eleven".